Fix rustfmt formatting violation in message_view.rs

[Copilot]

CI formatting check failed on a line exceeding rustfmt's preferred line length in message view scroll logic. Scrolling functionality (PageUp/PageDown, j/k, g/G) already exists and is documented in help.

Changes

• Split long method chain in src/ui/message_view.rs:39 across multiple lines per rustfmt style

// Before
let selected = app.selected_message_index.min(message_count.saturating_sub(1));

// After  
let selected = app
    .selected_message_index
    .min(message_count.saturating_sub(1));

Context

Scroll viewport tracking was implemented in prior commits. This PR only addresses the formatting violation blocking CI.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/srcfl/mqtop/actions/runs
  • Triggering command: /usr/bin/curl curl -s REDACTED /home/REDACTED/work/mqtop/mqtop/target/debug/deps/mockall_derive-1f5fc41bb6269229.mockall_derive.d42c099b603b9192-cgu.06.rcgu.o /home/REDACTED/work/mqtop/mqtop/target/debug/deps/mockall_derive-1f5fc41bb6269229.mockall_derive.d42c099b603b9192-cgu.07.rcgu.o /home/REDACTED/work/mqtop/mqtop/target/debug/deps/mockall_derive-1f5fc41bb6269229.mockall_derive.d42c099b603b9192-cgu.08.rcgu.o zvjybnmqbe5gr01x.1oi7czg.rcgu.o f014uwtjrkt5x87l.1oi7czg.rcgu.o lzf7p0edccpg21xq.1oi7czg.rcgu.o bhzyqtbnnr3vcaub.1oi7czg.rcgu.o rs0pvaempm001pnr.1oi7czg.rcgu.o 5i0ggarsjylnm179.1oi7czg.rcgu.o dm9hccpk746xxxne.1oi7czg.rcgu.o i2ajziyage1vyo9l.1oi7czg.rcgu.o icicqnzw7ape9fzv.1oi7czg.rcgu.o scujo1porolp1bkf.1oi7czg.rcgu.o 708c973uigs1y9ry.1oi7czg.rcgu.o u89x3x4ktxsy8986.1oi7czg.rcgu.o ph0i0izboo9wnm8w.1oi7czg.rcgu.o atall6lsvhkm6965.1oi7czg.rcgu.o (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>i want to be able to can scroll up and down in cli</issue_title>
<issue_description>i want to be able to can scroll up and down in cli when i have many topics in the tree

</issue_description>

<agent_instructions>still not fixed, build failed, please fix</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes i want to be able to can scroll up and down in cli #1

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